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        <li class="header">Part I</li>
        
        
    
        <li class="chapter " data-level="1.1" data-path="../../">
            
                <a href="../../">
            
                    
                    Introduction
            
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        </li>
    
        <li class="chapter " data-level="1.2" data-path="../C++必知必会的知识点/">
            
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                    C++必知必会的知识点
            
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        <li class="chapter " data-level="1.2.1" data-path="../C++必知必会的知识点/如何成为一名合格的CC++开发者？.html">
            
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                    如何成为一名合格的C/C++开发者？
            
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        </li>
    
        <li class="chapter " data-level="1.2.2" data-path="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                <a href="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                    
                    不定参数函数实现var_arg系列的宏
            
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        </li>
    
        <li class="chapter " data-level="1.2.3" data-path="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                <a href="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                    
                    你一定要搞明白的C函数调用方式与栈原理
            
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        <li class="chapter " data-level="1.2.4" data-path="../C++必知必会的知识点/深入理解CC++中的指针.html">
            
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                    深入理解C/C++中的指针
            
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                    详解C++11中的智能指针
            
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                    C++17结构化绑定
            
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                    C++必须掌握的pimpl惯用法
            
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                <a href="../C++必知必会的知识点/用VisualStudio调试Linux程序.html">
            
                    
                    用Visual Studio调试Linux程序
            
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        <li class="chapter " data-level="1.2.9" data-path="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                <a href="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                    
                    如何使用Visual Studio管理和阅读开源项目代码
            
                </a>
            

            
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        <li class="chapter " data-level="1.2.10" data-path="../C++必知必会的知识点/利用cmake工具生成VisualStudio工程文件.html">
            
                <a href="../C++必知必会的知识点/利用cmake工具生成VisualStudio工程文件.html">
            
                    
                    利用cmake工具生成Visual Studio工程文件
            
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            </ul>
            
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        <li class="chapter " data-level="1.3" data-path="../多线程/">
            
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                    多线程
            
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        <li class="chapter " data-level="1.3.1" data-path="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                <a href="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                    
                    后台C++开发你一定要知道的条件变量
            
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        <li class="chapter " data-level="1.3.2" data-path="../多线程/整型变量赋值是原子操作吗？.html">
            
                <a href="../多线程/整型变量赋值是原子操作吗？.html">
            
                    
                    整型变量赋值是原子操作吗？
            
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            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="2.1" data-path="../网络编程/">
            
                <a href="../网络编程/">
            
                    
                    网络编程
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.1" data-path="../网络编程/bind函数重难点解析.html">
            
                <a href="../网络编程/bind函数重难点解析.html">
            
                    
                    bind 函数重难点解析
            
                </a>
            

            
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        <li class="chapter " data-level="2.1.2" data-path="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                <a href="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                    
                    connect 函数在阻塞和非阻塞模式下的行为
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3" data-path="../网络编程/select函数重难点解析.html">
            
                <a href="../网络编程/select函数重难点解析.html">
            
                    
                    select 函数重难点解析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4" data-path="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                <a href="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                    
                    Linux epoll 模型（含LT 模式和 ET 模式详解）
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5" data-path="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                <a href="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                    
                    socket 的阻塞模式和非阻塞模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.6" data-path="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                <a href="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                    
                    非阻塞模式下 send 和 recv 函数的返回值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.7" data-path="../网络编程/服务器开发通信协议设计介绍.html">
            
                <a href="../网络编程/服务器开发通信协议设计介绍.html">
            
                    
                    服务器开发通信协议设计介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.8" data-path="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                <a href="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                    
                    TCP 协议如何解决粘包、半包问题
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.9" data-path="../网络编程/网络通信中收发数据的正确姿势.html">
            
                <a href="../网络编程/网络通信中收发数据的正确姿势.html">
            
                    
                    网络通信中收发数据的正确姿势
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.10" data-path="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                <a href="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                    
                    服务器端发数据时，如果对端一直不收，怎么办？
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="3.1" data-path="../程序员必知必会的网络命令/">
            
                <a href="../程序员必知必会的网络命令/">
            
                    
                    程序员必知必会的网络命令
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.1.1" data-path="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                <a href="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                    
                    利用telnet命令发电子邮件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.2" data-path="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                <a href="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                    
                    做Java或者C++开发都应该知道的lsof命令
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.3" data-path="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                <a href="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                    
                    Linux网络故障排查的瑞士军刀nc命令
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.4" data-path="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                <a href="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                    
                    Linux tcpdump使用详解
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.5" data-path="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                <a href="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                    
                    从抓包的角度分析connect函数的连接过程
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.6" data-path="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                <a href="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                    
                    服务器开发中网络数据分析与故障排查经验漫谈
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part II</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../高性能服务器框架设计/">
            
                <a href="../高性能服务器框架设计/">
            
                    
                    高性能服务器框架设计
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="4.1.1" data-path="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                <a href="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                    
                    主线程与工作线程的分工
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.2" data-path="../高性能服务器框架设计/Reactor模式.html">
            
                <a href="../高性能服务器框架设计/Reactor模式.html">
            
                    
                    Reactor模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.3" data-path="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                <a href="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                    
                    实例：一个服务器程序的架构介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.4" data-path="../高性能服务器框架设计/错误码系统的设计.html">
            
                <a href="../高性能服务器框架设计/错误码系统的设计.html">
            
                    
                    错误码系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.5" data-path="../高性能服务器框架设计/日志系统的设计.html">
            
                <a href="../高性能服务器框架设计/日志系统的设计.html">
            
                    
                    日志系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.6" data-path="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                <a href="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                    
                    如何设计断线自动重连机制
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.7" data-path="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                <a href="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                    
                    心跳包机制设计详解
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.8" data-path="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                <a href="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                    
                    业务数据处理一定要单独开线程吗
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.9" data-path="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                <a href="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                    
                    C++ 高性能服务器网络框架设计细节
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="5.1" data-path="../服务器开发案例实战/">
            
                <a href="../服务器开发案例实战/">
            
                    
                    服务器开发案例实战
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.1.1" data-path="../服务器开发案例实战/从零实现一个http服务器.html">
            
                <a href="../服务器开发案例实战/从零实现一个http服务器.html">
            
                    
                    从零实现一个http服务器
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.2" data-path="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                <a href="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                    
                    从零实现一款12306刷票软件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.3" data-path="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                <a href="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                    
                    从零实现一个邮件收发客户端
            
                </a>
            

            
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        <li class="chapter " data-level="5.1.4" data-path="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                <a href="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                    
                    从零开发一个WebSocket服务器
            
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        <li class="chapter " data-level="5.1.5" data-path="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                <a href="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                    
                    从零学习开源项目系列（一） 从一款多人联机实时对战游戏开始
            
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        <li class="chapter " data-level="5.1.6" data-path="../服务器开发案例实战/2最后一战概况.html">
            
                <a href="../服务器开发案例实战/2最后一战概况.html">
            
                    
                    从零学习开源项目系列（二） 最后一战概况
            
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        <li class="chapter " data-level="5.1.7" data-path="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                <a href="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                    
                    从零学习开源项目系列（三） CSBattleMgr服务源码研究
            
                </a>
            

            
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        <li class="chapter " data-level="5.1.8" data-path="../服务器开发案例实战/4LogServer源码探究.html">
            
                <a href="../服务器开发案例实战/4LogServer源码探究.html">
            
                    
                    从零学习开源项目系列（四）LogServer源码探究
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part III</li>
        
        
    
        <li class="chapter " data-level="6.1" data-path="../TeamTalk源码解析/">
            
                <a href="../TeamTalk源码解析/">
            
                    
                    TeamTalk IM源码分析
            
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        <li class="chapter " data-level="6.1.1" data-path="../TeamTalk源码解析/01TeamTalk介绍.html">
            
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                    01 TeamTalk介绍
            
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        <li class="chapter " data-level="6.1.2" data-path="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                <a href="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                    
                    02 服务器端的程序的编译与部署
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.3" data-path="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
            
                <a href="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
            
                    
                    03 服务器端的程序架构介绍
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.4" data-path="../TeamTalk源码解析/04服务器端db_proxy_server源码分析.html">
            
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                    04 服务器端db_proxy_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.5" data-path="../TeamTalk源码解析/05服务器端msg_server源码分析.html">
            
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                    05 服务器端msg_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.6" data-path="../TeamTalk源码解析/06服务器端login_server源码分析.html">
            
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                    06 服务器端login_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.7" data-path="../TeamTalk源码解析/07服务器端msfs源码分析.html">
            
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                    07 服务器端msfs源码分析
            
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        <li class="chapter " data-level="6.1.8" data-path="../TeamTalk源码解析/08服务器端file_server源码分析.html">
            
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                    08 服务器端file_server源码分析
            
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        <li class="chapter " data-level="6.1.9" data-path="../TeamTalk源码解析/09服务器端route_server源码分析.html">
            
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                    09 服务器端route_server源码分析
            
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        <li class="chapter " data-level="6.1.10" data-path="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                <a href="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                    
                    10 开放一个TeamTalk测试服务器地址和几个测试账号
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.11" data-path="../TeamTalk源码解析/11pc客户端源码分析.html">
            
                <a href="../TeamTalk源码解析/11pc客户端源码分析.html">
            
                    
                    11 pc客户端源码分析
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="7.1" data-path="../libevent源码深度剖析/">
            
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                    libevent源码深度剖析
            
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        <li class="chapter " data-level="7.1.1" data-path="../libevent源码深度剖析/libevent源码深度剖析01.html">
            
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                    libevent源码深度剖析01
            
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        <li class="chapter " data-level="7.1.2" data-path="../libevent源码深度剖析/libevent源码深度剖析02.html">
            
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                    libevent源码深度剖析02
            
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        <li class="chapter " data-level="7.1.3" data-path="../libevent源码深度剖析/libevent源码深度剖析03.html">
            
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                    libevent源码深度剖析03
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.4" data-path="../libevent源码深度剖析/libevent源码深度剖析04.html">
            
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                    libevent源码深度剖析04
            
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        <li class="chapter " data-level="7.1.5" data-path="../libevent源码深度剖析/libevent源码深度剖析05.html">
            
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                    libevent源码深度剖析05
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.6" data-path="../libevent源码深度剖析/libevent源码深度剖析06.html">
            
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                    libevent源码深度剖析06
            
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        <li class="chapter " data-level="7.1.7" data-path="../libevent源码深度剖析/libevent源码深度剖析07.html">
            
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                    libevent源码深度剖析07
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.8" data-path="../libevent源码深度剖析/libevent源码深度剖析08.html">
            
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                    libevent源码深度剖析08
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.9" data-path="../libevent源码深度剖析/libevent源码深度剖析09.html">
            
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                    libevent源码深度剖析09
            
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        <li class="chapter " data-level="7.1.10" data-path="../libevent源码深度剖析/libevent源码深度剖析10.html">
            
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                    libevent源码深度剖析10
            
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        <li class="chapter " data-level="7.1.11" data-path="../libevent源码深度剖析/libevent源码深度剖析11.html">
            
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                    libevent源码深度剖析11
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.1.12" data-path="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                <a href="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                    
                    libevent源码深度剖析12
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.13" data-path="../libevent源码深度剖析/libevent源码深度剖析13.html">
            
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                    libevent源码深度剖析13
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="7.2" data-path="./">
            
                <a href="./">
            
                    
                    leveldb源码分析
            
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        <li class="chapter " data-level="7.2.1" data-path="leveldb源码分析1.html">
            
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                    leveldb源码分析1
            
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        <li class="chapter " data-level="7.2.2" data-path="leveldb源码分析2.html">
            
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                    leveldb源码分析2
            
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        <li class="chapter " data-level="7.2.3" data-path="leveldb源码分析3.html">
            
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                    leveldb源码分析3
            
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        <li class="chapter " data-level="7.2.4" data-path="leveldb源码分析4.html">
            
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                    leveldb源码分析4
            
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        <li class="chapter " data-level="7.2.5" data-path="leveldb源码分析5.html">
            
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                    leveldb源码分析5
            
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        </li>
    
        <li class="chapter " data-level="7.2.6" data-path="leveldb源码分析6.html">
            
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                    leveldb源码分析6
            
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        </li>
    
        <li class="chapter " data-level="7.2.7" data-path="leveldb源码分析7.html">
            
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                    leveldb源码分析7
            
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        <li class="chapter " data-level="7.2.8" data-path="leveldb源码分析8.html">
            
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                    leveldb源码分析8
            
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        </li>
    
        <li class="chapter " data-level="7.2.9" data-path="leveldb源码分析9.html">
            
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                    leveldb源码分析9
            
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        </li>
    
        <li class="chapter " data-level="7.2.10" data-path="leveldb源码分析10.html">
            
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                    leveldb源码分析10
            
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        <li class="chapter " data-level="7.2.11" data-path="leveldb源码分析11.html">
            
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                    leveldb源码分析11
            
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        <li class="chapter " data-level="7.2.12" data-path="leveldb源码分析12.html">
            
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                    leveldb源码分析12
            
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        <li class="chapter " data-level="7.2.13" data-path="leveldb源码分析13.html">
            
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                    leveldb源码分析13
            
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        <li class="chapter " data-level="7.2.14" data-path="leveldb源码分析14.html">
            
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                    leveldb源码分析14
            
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        <li class="chapter " data-level="7.2.15" data-path="leveldb源码分析15.html">
            
                <a href="leveldb源码分析15.html">
            
                    
                    leveldb源码分析15
            
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        <li class="chapter " data-level="7.2.16" data-path="leveldb源码分析16.html">
            
                <a href="leveldb源码分析16.html">
            
                    
                    leveldb源码分析16
            
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        <li class="chapter " data-level="7.2.17" data-path="leveldb源码分析17.html">
            
                <a href="leveldb源码分析17.html">
            
                    
                    leveldb源码分析17
            
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        <li class="chapter " data-level="7.2.18" data-path="leveldb源码分析18.html">
            
                <a href="leveldb源码分析18.html">
            
                    
                    leveldb源码分析18
            
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        <li class="chapter " data-level="7.2.19" data-path="leveldb源码分析19.html">
            
                <a href="leveldb源码分析19.html">
            
                    
                    leveldb源码分析19
            
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        <li class="chapter " data-level="7.2.20" data-path="leveldb源码分析20.html">
            
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                    leveldb源码分析20
            
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        </li>
    
        <li class="chapter " data-level="7.2.21" data-path="leveldb源码分析21.html">
            
                <a href="leveldb源码分析21.html">
            
                    
                    leveldb源码分析21
            
                </a>
            

            
        </li>
    
        <li class="chapter active" data-level="7.2.22" data-path="leveldb源码分析22.html">
            
                <a href="leveldb源码分析22.html">
            
                    
                    leveldb源码分析22
            
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            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="8.1" data-path="../Memcached源码分析/">
            
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                    Memcached源码分析
            
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        <li class="chapter " data-level="8.1.1" data-path="../Memcached源码分析/00服务器资源调整.html">
            
                <a href="../Memcached源码分析/00服务器资源调整.html">
            
                    
                    00 服务器资源调整
            
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        <li class="chapter " data-level="8.1.2" data-path="../Memcached源码分析/01初始化参数解析.html">
            
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                    01 初始化参数解析
            
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        <li class="chapter " data-level="8.1.3" data-path="../Memcached源码分析/02网络监听的建立.html">
            
                <a href="../Memcached源码分析/02网络监听的建立.html">
            
                    
                    02 网络监听的建立
            
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        <li class="chapter " data-level="8.1.4" data-path="../Memcached源码分析/03网络连接建立.html">
            
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                    03 网络连接建立
            
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        <li class="chapter " data-level="8.1.5" data-path="../Memcached源码分析/04内存初始化.html">
            
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                    04 内存初始化
            
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        <li class="chapter " data-level="8.1.6" data-path="../Memcached源码分析/05资源初始化.html">
            
                <a href="../Memcached源码分析/05资源初始化.html">
            
                    
                    05 资源初始化
            
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        <li class="chapter " data-level="8.1.7" data-path="../Memcached源码分析/06get过程.html">
            
                <a href="../Memcached源码分析/06get过程.html">
            
                    
                    06 get过程
            
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        <li class="chapter " data-level="8.1.8" data-path="../Memcached源码分析/07cas属性.html">
            
                <a href="../Memcached源码分析/07cas属性.html">
            
                    
                    07 cas属性
            
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        <li class="chapter " data-level="8.1.9" data-path="../Memcached源码分析/08内存池.html">
            
                <a href="../Memcached源码分析/08内存池.html">
            
                    
                    08 内存池
            
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        <li class="chapter " data-level="8.1.10" data-path="../Memcached源码分析/09连接队列.html">
            
                <a href="../Memcached源码分析/09连接队列.html">
            
                    
                    09 连接队列
            
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        <li class="chapter " data-level="8.1.11" data-path="../Memcached源码分析/10Hash表操作.html">
            
                <a href="../Memcached源码分析/10Hash表操作.html">
            
                    
                    10 Hash表操作
            
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        <li class="chapter " data-level="8.1.12" data-path="../Memcached源码分析/12set操作.html">
            
                <a href="../Memcached源码分析/12set操作.html">
            
                    
                    12 set操作
            
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        <li class="chapter " data-level="8.1.13" data-path="../Memcached源码分析/13do_item_alloc操作.html">
            
                <a href="../Memcached源码分析/13do_item_alloc操作.html">
            
                    
                    13 do_item_alloc操作
            
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        <li class="chapter " data-level="8.1.14" data-path="../Memcached源码分析/14item结构.html">
            
                <a href="../Memcached源码分析/14item结构.html">
            
                    
                    14 item结构
            
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        <li class="chapter " data-level="8.1.15" data-path="../Memcached源码分析/15Hash表扩容.html">
            
                <a href="../Memcached源码分析/15Hash表扩容.html">
            
                    
                    15 Hash表扩容
            
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        <li class="chapter " data-level="8.1.16" data-path="../Memcached源码分析/16线程交互.html">
            
                <a href="../Memcached源码分析/16线程交互.html">
            
                    
                    16 线程交互
            
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        <li class="chapter " data-level="8.1.17" data-path="../Memcached源码分析/17状态机.html">
            
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                    17 状态机
            
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        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="9.1" data-path="../游戏开发专题/">
            
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                    游戏开发专题
            
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                    1 游戏服务器开发的基本体系与服务器端开发的一些建议
            
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        <li class="chapter " data-level="9.1.2" data-path="../游戏开发专题/2网络游戏服务器开发框架设计介绍.html">
            
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                    2 网络游戏服务器开发框架设计介绍
            
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        <li class="chapter " data-level="9.1.3" data-path="../游戏开发专题/3游戏后端开发需要掌握的知识.html">
            
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                    3 游戏后端开发需要掌握的知识
            
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        <li class="chapter " data-level="9.1.4" data-path="../游戏开发专题/4关于游戏服务端架构的整理.html">
            
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                    4 关于游戏服务端架构的整理
            
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                    5 各类游戏对应的服务端架构
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.6" data-path="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
            
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        <li class="chapter " data-level="9.1.7" data-path="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
            
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                    7 QQ游戏百万人同时在线服务器架构实现
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.8" data-path="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
            
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                </a>
            

            
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                </a>
            

            
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        </li>
    

            </ul>
            
        </li>
    

    
        
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                </a>
            

            
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                    聊聊技术人员的常见的职业问题
            
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        <li class="chapter " data-level="10.2.3" data-path="../职业规划/写给那些傻傻想做服务器开发的朋友.html">
            
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        <li class="chapter " data-level="10.3" data-path="../自我提升与开源代码/">
            
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        <li class="chapter " data-level="10.5" data-path="../程序员的简历/">
            
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                </a>
            

            
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        <li class="chapter " data-level="10.5.1" data-path="../程序员的简历/程序员如何写简历.html">
            
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                </a>
            

            
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            </ul>
            
        </li>
    
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        <li class="chapter " data-level="10.7" data-path="../程序员的烦心事/">
            
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        <li class="chapter " data-level="10.8" data-path="../作者的故事/">
            
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                    作者的故事
            
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                    我的 2019
            
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                    我是如何年薪五十万的
            
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						<div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><li><span class="title-icon "></span><a href="#leveldb&#x6E90;&#x7801;&#x5206;&#x6790;22"><b></b>leveldb&#x6E90;&#x7801;&#x5206;&#x6790;22</a></li><ul><li><span class="title-icon "></span><a href="#14-db&#x7684;&#x67E5;&#x8BE2;&#x4E0E;&#x904D;&#x5386;&#x4E4B;2"><b></b>14 DB&#x7684;&#x67E5;&#x8BE2;&#x4E0E;&#x904D;&#x5386;&#x4E4B;2</a></li><ul><li><span class="title-icon "></span><a href="#144-dbiter"><b></b>14.4 DBIter</a></li><li><span class="title-icon "></span><a href="#145-&#x5C0F;&#x7ED3;"><b></b>14.5 &#x5C0F;&#x7ED3;</a></li></ul></ul></ul></div><h1 id="leveldb&#x6E90;&#x7801;&#x5206;&#x6790;22"><a name="leveldb&#x6E90;&#x7801;&#x5206;&#x6790;22" class="anchor-navigation-ex-anchor" href="#leveldb&#x6E90;&#x7801;&#x5206;&#x6790;22"><i class="fa fa-link" aria-hidden="true"></i></a>leveldb&#x6E90;&#x7801;&#x5206;&#x6790;22</h1>
<p>&#x672C;&#x7CFB;&#x5217;&#x300A;leveldb&#x6E90;&#x7801;&#x5206;&#x6790;&#x300B;&#x5171;&#x6709;22&#x7BC7;&#x6587;&#x7AE0;&#xFF0C;&#x8FD9;&#x662F;&#x7B2C;&#x4E8C;&#x5341;&#x4E8C;&#x7BC7;</p>
<h2 id="14-db&#x7684;&#x67E5;&#x8BE2;&#x4E0E;&#x904D;&#x5386;&#x4E4B;2"><a name="14-db&#x7684;&#x67E5;&#x8BE2;&#x4E0E;&#x904D;&#x5386;&#x4E4B;2" class="anchor-navigation-ex-anchor" href="#14-db&#x7684;&#x67E5;&#x8BE2;&#x4E0E;&#x904D;&#x5386;&#x4E4B;2"><i class="fa fa-link" aria-hidden="true"></i></a>14 DB&#x7684;&#x67E5;&#x8BE2;&#x4E0E;&#x904D;&#x5386;&#x4E4B;2</h2>
<h3 id="144-dbiter"><a name="144-dbiter" class="anchor-navigation-ex-anchor" href="#144-dbiter"><i class="fa fa-link" aria-hidden="true"></i></a><strong>14.4 DBIter</strong></h3>
<p>Leveldb&#x6570;&#x636E;&#x5E93;&#x7684;<strong>MemTable</strong>&#x548C;<strong>sstable</strong>&#x6587;&#x4EF6;&#x7684;&#x5B58;&#x50A8;&#x683C;&#x5F0F;&#x90FD;&#x662F;<strong>(user key, seq, type) =&gt; uservalue</strong>&#x3002;DBIter&#x628A;&#x540C;&#x4E00;&#x4E2A;userkey&#x5728;DB&#x4E2D;&#x7684;&#x591A;&#x6761;&#x8BB0;&#x5F55;&#x5408;&#x5E76;&#x4E3A;&#x4E00;&#x6761;&#xFF0C;&#x7EFC;&#x5408;&#x8003;&#x8651;&#x4E86;userkey&#x7684;&#x5E8F;&#x53F7;&#x3001;&#x5220;&#x9664;&#x6807;&#x8BB0;&#x3001;&#x548C;&#x5199;&#x8986;&#x76D6;&#x7B49;&#x7B49;&#x56E0;&#x7D20;&#x3002;
&#x4ECE;&#x524D;&#x9762;&#x51FD;&#x6570;<strong>NewIterator</strong>&#x7684;&#x4EE3;&#x7801;&#x8FD8;&#x80FD;&#x770B;&#x5230;&#xFF0C;DBIter&#x5185;&#x90E8;&#x4F7F;&#x7528;&#x4E86;<strong>MergingIterator</strong>&#xFF0C;&#x5728;&#x8C03;&#x7528;MergingItertor&#x7684;&#x7CFB;&#x5217;seek&#x51FD;&#x6570;&#x540E;&#xFF0C;DBIter&#x8FD8;&#x8981;&#x5904;&#x7406;key&#x7684;&#x5220;&#x9664;&#x6807;&#x8BB0;&#x3002;&#x5426;&#x5219;&#xFF0C;&#x904D;&#x5386;&#x65F6;&#x4F1A;&#x628A;&#x5DF2;&#x5220;&#x9664;&#x7684;key&#x5217;&#x4E3E;&#x51FA;&#x6765;&#x3002;
DBIter&#x8FD8;&#x5B9A;&#x4E49;&#x4E86;&#x4E24;&#x4E2A;&#x79FB;&#x52A8;&#x65B9;&#x5411;&#xFF0C;&#x9ED8;&#x8BA4;&#x662F;kForward&#xFF1A;
1&#xFF09; <strong>kForward</strong>&#xFF0C;&#x5411;&#x524D;&#x79FB;&#x52A8;&#xFF0C;&#x4EE3;&#x7801;&#x4FDD;&#x8BC1;&#x6B64;&#x65F6;DBIter&#x7684;&#x5185;&#x90E8;&#x8FED;&#x4EE3;&#x5668;&#x521A;&#x597D;&#x5B9A;&#x4F4D;&#x5728;this-&gt;key(),this-&gt;value()&#x8FD9;&#x6761;&#x8BB0;&#x5F55;&#x4E0A;&#xFF1B;
2&#xFF09; <strong>kReverse</strong>&#xFF0C;&#x5411;&#x540E;&#x79FB;&#x52A8;&#xFF0C;&#x4EE3;&#x7801;&#x4FDD;&#x8BC1;&#x6B64;&#x65F6;DBIter&#x7684;&#x5185;&#x90E8;&#x8FED;&#x4EE3;&#x5668;&#x521A;&#x597D;&#x5B9A;&#x4F4D;&#x5728;&#x6240;&#x6709;key=this-&gt;key()&#x7684;entry&#x4E4B;&#x524D;&#x3002;
&#x5176;&#x6210;&#x5458;&#x53D8;&#x91CF;savedkey&#x548C;saved value&#x4FDD;&#x5B58;&#x7684;&#x662F;KReverse&#x65B9;&#x5411;&#x79FB;&#x52A8;&#x65F6;&#x7684;k/v&#x5BF9;&#xFF0C;&#x6BCF;&#x6B21;seek&#x7CFB;&#x8C03;&#x7528;&#x4E4B;&#x540E;&#xFF0C;&#x5176;&#x503C;&#x90FD;&#x4F1A;&#x8DDF;&#x968F;iter_&#x800C;&#x6539;&#x53D8;&#x3002;
DBIter&#x7684;&#x4EE3;&#x7801;&#x5F00;&#x59CB;&#x8BFB;&#x6765;&#x611F;&#x89C9;&#x6709;&#x4E9B;&#x7ED5;&#xFF0C;&#x4E3B;&#x8981;&#x5C31;&#x662F;&#x5B83;&#x8981;&#x5904;&#x7406;&#x5220;&#x9664;&#x6807;&#x8BB0;&#xFF0C;&#x800C;&#x4E14;&#x5176;&#x5E95;&#x5C42;&#x7684;MergingIterator&#xFF0C;&#x5BF9;&#x4E8E;&#x540C;&#x4E00;&#x4E2A;key&#x4F1A;&#x6709;&#x591A;&#x4E2A;&#x4E0D;&#x540C;sequence&#x7684;entry&#x3002;&#x5BFC;&#x81F4;&#x5176;Next/Prev&#x64CD;&#x4F5C;&#x6BD4;&#x8F83;&#x590D;&#x6742;&#xFF0C;&#x8981;&#x8003;&#x8651;&#x5230;&#x4E0A;&#x4E00;&#x6B21;&#x79FB;&#x52A8;&#x7684;&#x5F71;&#x54CD;&#xFF0C;&#x8DF3;&#x8FC7;&#x5220;&#x9664;&#x6807;&#x8BB0;&#x548C;&#x91CD;&#x590D;&#x7684;key&#x3002;
DBIter&#x5FC5;&#x987B;&#x5BFC;&#x51FA;Iterator&#x5B9A;&#x4E49;&#x7684;&#x51E0;&#x4E2A;&#x63A5;&#x53E3;&#xFF0C;&#x4E0B;&#x9762;&#x5C31;&#x62D6;&#x51FA;&#x6765;&#x6328;&#x4E2A;&#x5206;&#x6790;&#x3002;</p>
<h4 id="1441-get&#x7CFB;&#x63A5;&#x53E3;"><a name="1441-get&#x7CFB;&#x63A5;&#x53E3;" class="anchor-navigation-ex-anchor" href="#1441-get&#x7CFB;&#x63A5;&#x53E3;"><i class="fa fa-link" aria-hidden="true"></i></a><strong>14.4.1 Get&#x7CFB;&#x63A5;&#x53E3;</strong></h4>
<p>&#x9996;&#x5148;&#x662F;&#x51E0;&#x4E2A;&#x7B80;&#x5355;&#x63A5;&#x53E3;&#xFF0C;&#x83B7;&#x53D6;key&#x3001;value&#x548C;status&#x7684;&#xFF1A;</p>
<pre class="language-"><code>//kForward&#x76F4;&#x63A5;&#x53D6;iter_-&gt;value()&#xFF0C;&#x5426;&#x5219;&#x53D6;saved value
virtual Slice value() const {  
    assert(valid_);
    return (direction_ == kForward) ? iter_-&gt;value() : saved_value_;
}

virtual Status status() const {
    if (status_.ok()) 
        returniter_-&gt;status();
    return status_;
}
</code></pre><h4 id="1442-&#x8F85;&#x52A9;&#x51FD;&#x6570;"><a name="1442-&#x8F85;&#x52A9;&#x51FD;&#x6570;" class="anchor-navigation-ex-anchor" href="#1442-&#x8F85;&#x52A9;&#x51FD;&#x6570;"><i class="fa fa-link" aria-hidden="true"></i></a><strong>14.4.2 &#x8F85;&#x52A9;&#x51FD;&#x6570;</strong></h4>
<p>&#x5728;&#x5206;&#x6790;seek&#x7CFB;&#x51FD;&#x6570;&#x4E4B;&#x524D;&#xFF0C;&#x5148;&#x6765;&#x7406;&#x89E3;&#x4E24;&#x4E2A;&#x91CD;&#x8981;&#x7684;&#x8F85;&#x52A9;&#x51FD;&#x6570;&#xFF1A;<strong>FindNextUserEntry</strong>&#x548C;<strong>FindPrevUserEntry</strong>&#x7684;&#x529F;&#x80FD;&#x548C;&#x903B;&#x8F91;&#x3002;&#x5176;&#x529F;&#x80FD;&#x5C31;&#x662F;&#x5FAA;&#x73AF;&#x8DF3;&#x8FC7;&#x4E0B;&#x4E00;&#x4E2A;/&#x524D;&#x4E00;&#x4E2A;delete&#x7684;&#x8BB0;&#x5F55;&#xFF0C;&#x76F4;&#x5230;&#x9047;&#x5230;<strong>kValueType</strong>&#x7684;&#x8BB0;&#x5F55;&#x3002;
&#x5148;&#x6765;&#x770B;&#x770B;&#xFF0C;&#x51FD;&#x6570;&#x58F0;&#x660E;&#x4E3A;&#xFF1A;
<strong>void DBIter::FindNextUserEntry(bool skipping, std::string* skip)</strong>
&#x53C2;&#x6570;@skipping&#x8868;&#x660E;&#x662F;&#x5426;&#x8981;&#x8DF3;&#x8FC7;sequence&#x66F4;&#x5C0F;&#x7684;entry&#xFF1B;
&#x53C2;&#x6570;@skip&#x4E34;&#x65F6;&#x5B58;&#x50A8;&#x7A7A;&#x95F4;&#xFF0C;&#x4FDD;&#x5B58;seek&#x65F6;&#x8981;&#x8DF3;&#x8FC7;&#x7684;key&#xFF1B;
&#x5728;&#x8FDB;&#x5165;FindNextUserEntry&#x65F6;&#xFF0C;iter_&#x521A;&#x597D;&#x5B9A;&#x4F4D;&#x5728;this-&gt;key(), this-&gt;value()&#x8FD9;&#x6761;&#x8BB0;&#x5F55;&#x4E0A;&#x3002;&#x4E0B;&#x9762;&#x6765;&#x770B;&#x51FD;&#x6570;&#x5B9E;&#x73B0;&#xFF1A;</p>
<pre class="language-"><code>virtual Slice key() const { //kForward&#x76F4;&#x63A5;&#x53D6;iter_-&gt;key()&#xFF0C;&#x5426;&#x5219;&#x53D6;saved key  
    assert(valid_);
    return (direction_ == kForward) ? ExtractUserKey(iter_-&gt;key()) : saved_key_;
}

// &#x5FAA;&#x73AF;&#x76F4;&#x5230;&#x627E;&#x5230;&#x5408;&#x9002;&#x7684;entry&#xFF0C;direction&#x5FC5;&#x987B;&#x662F;kForward  
assert(iter_-&gt;Valid());
assert(direction_ == kForward);
do {
    ParsedInternalKey ikey;
    // &#x786E;&#x4FDD;iter_-&gt;key()&#x7684;sequence &lt;= &#x904D;&#x5386;&#x6307;&#x5B9A;&#x7684;sequence  
    if (ParseKey(&amp;ikey) &amp;&amp; ikey.sequence &lt;= sequence_) {
        switch (ikey.type) {
        case kTypeDeletion:
            //&#x5BF9;&#x4E8E;&#x8BE5;key&#xFF0C;&#x8DF3;&#x8FC7;&#x540E;&#x9762;&#x9047;&#x5230;&#x7684;&#x6240;&#x6709;entry&#xFF0C;&#x5B83;&#x4EEC;&#x88AB;&#x8FD9;&#x6B21;&#x5220;&#x9664;&#x8986;&#x76D6;&#x4E86;  
            //&#x4FDD;&#x5B58;key&#x5230;skip&#x4E2D;&#xFF0C;&#x5E76;&#x8BBE;&#x7F6E;skipping=true  
            SaveKey(ikey.user_key, skip);
            skipping = true;
            break;
        case kTypeValue:
            if (skipping &amp;&amp;
                user_comparator_-&gt;Compare(ikey.user_key, *skip) &lt;= 0) {
                // &#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x88AB;&#x5220;&#x9664;&#x8986;&#x76D6;&#x7684;entry&#xFF0C;&#x6216;&#x8005;user key&#x6BD4;&#x6307;&#x5B9A;&#x7684;key&#x5C0F;&#xFF0C;&#x8DF3;&#x8FC7;  
            }
            else { // &#x627E;&#x5230;&#xFF0C;&#x6E05;&#x7A7A;saved key&#x5E76;&#x8FD4;&#x56DE;&#xFF0C;iter_&#x5DF2;&#x5B9A;&#x4F4D;&#x5230;&#x6B63;&#x786E;&#x7684;entry  
                valid_ = true;
                saved_key_.clear();
                return;
            }
            break;
        }
    }
    iter_-&gt;Next(); // &#x7EE7;&#x7EED;&#x68C0;&#x67E5;&#x4E0B;&#x4E00;&#x4E2A;entry  
} while (iter_-&gt;Valid());
// &#x5230;&#x8FD9;&#x91CC;&#x8868;&#x660E;&#x5DF2;&#x7ECF;&#x627E;&#x5230;&#x6700;&#x540E;&#x4E86;&#xFF0C;&#x6CA1;&#x6709;&#x7B26;&#x5408;&#x7684;entry  
saved_key_.clear();
valid_ = false;
</code></pre><p>FindNextUserKey&#x79FB;&#x52A8;&#x65B9;&#x5411;&#x662F;<strong>kForward</strong>&#xFF0C;DBIter&#x5728;&#x5411;kForward&#x79FB;&#x52A8;&#x65F6;&#xFF0C;&#x501F;&#x7528;&#x4E86;saved key&#x4F5C;&#x4E3A;&#x4E34;&#x65F6;&#x7F13;&#x5B58;&#x3002;FindNextUserKey&#x786E;&#x4FDD;&#x5B9A;&#x4F4D;&#x5230;&#x7684;entry&#x7684;sequence&#x4E0D;&#x4F1A;&#x5927;&#x4E8E;&#x6307;&#x5B9A;&#x7684;sequence&#xFF0C;&#x5E76;&#x8DF3;&#x8FC7;&#x88AB;&#x5220;&#x9664;&#x6807;&#x8BB0;&#x8986;&#x76D6;&#x7684;&#x65E7;&#x8BB0;&#x5F55;&#x3002;
&#x63A5;&#x4E0B;&#x6765;&#x662F;FindPrevUserKey&#xFF0C;&#x51FD;&#x6570;&#x58F0;&#x660E;&#x4E3A;&#xFF1A;<strong>void DBIter::FindPrevUserEntry()</strong>&#xFF0C;&#x5728;&#x8FDB;&#x5165;FindPrevUserEntry&#x65F6;&#xFF0C;iter_&#x521A;&#x597D;&#x4F4D;&#x4E8E;saved key&#x5BF9;&#x5E94;&#x7684;&#x6240;&#x6709;&#x8BB0;&#x5F55;&#x4E4B;&#x524D;&#x3002;&#x6E90;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code>assert(direction_ == kReverse); // &#x786E;&#x4FDD;&#x662F;kReverse&#x65B9;&#x5411;  
ValueType value_type =kTypeDeletion; //&#x540E;&#x9762;&#x7684;&#x5FAA;&#x73AF;&#x81F3;&#x5C11;&#x6267;&#x884C;&#x4E00;&#x6B21;Prev&#x64CD;&#x4F5C;  
if (iter_-&gt;Valid()) {  
    do { // &#x5FAA;&#x73AF;  
        // &#x786E;&#x4FDD;iter_-&gt;key()&#x7684;sequence &lt;= &#x904D;&#x5386;&#x6307;&#x5B9A;&#x7684;sequence  
        ParsedInternalKey ikey;  
        if (ParseKey(&amp;ikey)&amp;&amp; ikey.sequence &lt;= sequence_) {  
            if ((value_type !=kTypeDeletion) &amp;&amp;  
                user_comparator_-&gt;Compare(ikey.user_key, saved_key_) &lt; 0) {  
            break; // &#x6211;&#x4EEC;&#x9047;&#x5230;&#x4E86;&#x524D;&#x4E00;&#x4E2A;key&#x7684;&#x4E00;&#x4E2A;&#x672A;&#x88AB;&#x5220;&#x9664;&#x7684;entry&#xFF0C;&#x8DF3;&#x51FA;&#x5FAA;&#x73AF;  
             // &#x6B64;&#x65F6;Key()&#x5C06;&#x8FD4;&#x56DE;saved_key&#xFF0C;saved key&#x975E;&#x7A7A;&#xFF1B;  
        }  
        //&#x6839;&#x636E;&#x7C7B;&#x578B;&#xFF0C;&#x5982;&#x679C;&#x662F;Deletion&#x5219;&#x6E05;&#x7A7A;saved key&#x548C;saved value  
        //&#x5426;&#x5219;&#xFF0C;&#x628A;iter_&#x7684;user key&#x548C;value&#x8D4B;&#x7ED9;saved key&#x548C;saved value  
        value_type = ikey.type;  
        if (value_type ==kTypeDeletion) {  
            saved_key_.clear();  
            ClearSavedValue();  
        } else {  
            Slice raw_value =iter_-&gt;value();  
            if(saved_value_.capacity() &gt; raw_value.size() + 1048576) {  
                std::string empty;  
                swap(empty,saved_value_);  
            }  
         SaveKey(ExtractUserKey(iter_-&gt;key()), &amp;saved_key_);  
         saved_value_.assign(raw_value.data(), raw_value.size());  
        }  
      }  
      iter_-&gt;Prev(); // &#x524D;&#x4E00;&#x4E2A;  
    } while (iter_-&gt;Valid());  
  }  
  if (value_type == kTypeDeletion){ // &#x8868;&#x660E;&#x904D;&#x5386;&#x7ED3;&#x675F;&#x4E86;&#xFF0C;&#x5C06;direction&#x8BBE;&#x7F6E;&#x4E3A;kForward  
      valid_ = false;  
      saved_key_.clear();  
      ClearSavedValue();  
      direction_ = kForward;  
  } else {  
  valid_ = true;  
}
</code></pre><p>&#x51FD;&#x6570;FindPrevUserKey&#x6839;&#x636E;&#x6307;&#x5B9A;&#x7684;<strong>sequence</strong>&#xFF0C;&#x4F9D;&#x6B21;&#x68C0;&#x67E5;&#x524D;&#x4E00;&#x4E2A;entry&#xFF0C;&#x76F4;&#x5230;&#x9047;&#x5230;user key&#x5C0F;&#x4E8E;saved key&#xFF0C;&#x5E76;&#x4E14;&#x7C7B;&#x578B;&#x4E0D;&#x662F;Delete&#x7684;entry&#x3002;&#x5982;&#x679C;entry&#x7684;&#x7C7B;&#x578B;&#x662F;Delete&#xFF0C;&#x5C31;&#x6E05;&#x7A7A;saved key&#x548C;saved value&#xFF0C;&#x8FD9;&#x6837;&#x5728;&#x4F9D;&#x6B21;&#x904D;&#x5386;&#x524D;&#x4E00;&#x4E2A;entry&#x7684;&#x5FAA;&#x73AF;&#x4E2D;&#xFF0C;&#x53EA;&#x8981;&#x7C7B;&#x578B;&#x4E0D;&#x662F;Delete&#xFF0C;&#x5C31;&#x662F;&#x8981;&#x627E;&#x7684;entry&#x3002;&#x8FD9;&#x5C31;&#x662F;Prev&#x7684;&#x8BED;&#x4E49;&#x3002;</p>
<h4 id="1443-seek&#x7CFB;&#x51FD;&#x6570;"><a name="1443-seek&#x7CFB;&#x51FD;&#x6570;" class="anchor-navigation-ex-anchor" href="#1443-seek&#x7CFB;&#x51FD;&#x6570;"><i class="fa fa-link" aria-hidden="true"></i></a><strong>14.4.3 Seek&#x7CFB;&#x51FD;&#x6570;</strong></h4>
<p>&#x4E86;&#x89E3;&#x4E86;&#x8FD9;&#x4E24;&#x4E2A;&#x91CD;&#x8981;&#x7684;&#x8F85;&#x52A9;&#x51FD;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x5206;&#x6790;&#x51E0;&#x4E2A;Seek&#x63A5;&#x53E3;&#x4E86;&#xFF0C;&#x5B83;&#x4EEC;&#x9700;&#x8981;&#x501F;&#x52A9;&#x4E8E;&#x4E0A;&#x9762;&#x7684;&#x8FD9;&#x4E24;&#x4E2A;&#x51FD;&#x6570;&#x6765;&#x8DF3;&#x8FC7;&#x88AB;delete&#x7684;&#x8BB0;&#x5F55;&#x3002;</p>
<pre class="language-"><code>void DBIter::Seek(const Slice&amp; target) {  
    direction_ = kForward; // &#x5411;&#x524D;seek  
    // &#x6E05;&#x7A7A;saved value&#x548C;saved key&#xFF0C;&#x5E76;&#x6839;&#x636E;target&#x8BBE;&#x7F6E;saved key  
    ClearSavedValue();  
    saved_key_.clear();  
    AppendInternalKey( // kValueTypeForSeek(1) &gt; kDeleteType(0)  
        &amp;saved_key_,ParsedInternalKey(target, sequence_, kValueTypeForSeek));  
    iter_-&gt;Seek(saved_key_); // iter seek&#x5230;saved key  
    //&#x53EF;&#x4EE5;&#x5B9A;&#x4F4D;&#x5230;&#x5408;&#x6CD5;&#x7684;iter&#xFF0C;&#x8FD8;&#x9700;&#x8981;&#x8DF3;&#x8FC7;Delete&#x7684;entry  
    if (iter_-&gt;Valid()) FindNextUserEntry(false,&amp;saved_key_);  
    else valid_ = false;  
}                                                                                                                                         

void DBIter::SeekToFirst() {  
    direction_ = kForward; // &#x5411;&#x524D;seek  
    // &#x6E05;&#x7A7A;saved value&#xFF0C;&#x9996;&#x5148;iter_-&gt;SeekToFirst&#xFF0C;&#x7136;&#x540E;&#x8DF3;&#x8FC7;Delete&#x7684;entry  
    ClearSavedValue();  
    iter_-&gt;SeekToFirst();  
    if (iter_-&gt;Valid()) FindNextUserEntry(false,&amp;saved_key_ /*&#x4E34;&#x65F6;&#x5B58;&#x50A8;*/);  
    else valid_ = false;  
}  

void DBIter::SeekToLast() { // &#x66F4;&#x7B80;&#x5355;  
    direction_ = kReverse;  
    ClearSavedValue();  
    iter_-&gt;SeekToLast();  
    FindPrevUserEntry();  
}
</code></pre><h4 id="1444-prev&#x548C;next"><a name="1444-prev&#x548C;next" class="anchor-navigation-ex-anchor" href="#1444-prev&#x548C;next"><i class="fa fa-link" aria-hidden="true"></i></a><strong>14.4.4 Prev()&#x548C;Next()</strong></h4>
<p>Next&#x548C;Prev&#x63A5;&#x53E3;&#xFF0C;&#x76F8;&#x5BF9;&#x590D;&#x6742;&#x4E00;&#x4E9B;&#x3002;&#x548C;&#x5E95;&#x5C42;&#x7684;merging iterator&#x4E0D;&#x540C;&#xFF0C;DBIter&#x7684;Prev&#x548C;Next&#x6B65;&#x8FDB;&#x662F;<strong>&#x4EE5;key&#x4E3A;&#x5355;&#x4F4D;&#x7684;</strong>&#xFF0C;&#x800C;mergingiterator&#x662F;&#x4EE5;&#x4E00;&#x4E2A;record&#x4E3A;&#x5355;&#x4F4D;&#x7684;&#x3002;&#x6240;&#x4EE5;&#x5728;&#x8C03;&#x7528;merging Iterator&#x505A;Prev&#x548C;Next&#x8FED;&#x4EE3;&#x65F6;&#xFF0C;&#x5FC5;&#x987B;&#x5FAA;&#x73AF;&#x76F4;&#x5230;key&#x53D1;&#x751F;&#x6539;&#x53D8;&#x3002;
&#x8FD9;&#x6B21;&#x8BA9;&#x6211;&#x4EEC;&#x4EE5;Prev&#x4E3A;&#x4F8B;&#xFF0C;&#x4EE5;14.4-1&#x56FE;&#x89E3;&#x4E00;&#x4E0B;&#xFF0C;&#x8FD8;&#x771F;&#x662F;&#x4E00;&#x56FE;&#x80DC;&#x5343;&#x8A00;&#x554A;&#x3002;
&#x5047;&#x8BBE;&#x6307;&#x5B9A;&#x8BFB;&#x53D6;&#x7684;sequence&#x4E3A;2&#xFF0C;&#x5F53;&#x524D;iter&#x5728;key4:2:1&#x4E0A;&#xFF0C;direction&#x4E3A;kForward&#x3002;&#x6B64;&#x65F6;&#x8C03;&#x7528;Prev()&#xFF0C;&#x6B64;&#x56FE;&#x663E;&#x793A;&#x4E86;Prev&#x64CD;&#x4F5C;&#x6267;&#x884C;&#x7684;5&#x4E2A;&#x6B65;&#x9AA4;&#xFF1A;</p>
<p><img src="../imgs/leveldb20.webp" alt=""></p>
<p>S1 &#x9996;&#x5148;&#x56E0;&#x4E3A;direction&#x4E3A;kForward&#xFF0C;&#x5148;&#x8C03;&#x6574;iter&#x5230;key3:1:1&#x4E0A;&#x3002;&#x6B64;&#x56FE;&#x4E5F;&#x8BF4;&#x660E;&#x4E86;&#x8C03;&#x6574;&#x7684;&#x7406;&#x7531;&#xFF0C;key4:2:1&#x524D;&#x9762;&#x8FD8;&#x6709;key4:3:1&#x3002;&#x7136;&#x540E;&#x8FDB;&#x5165;FindPrevUserEntry&#x51FD;&#x6570;&#xFF0C;&#x6267;&#x884C;S2&#x5230;S4&#x3002;
S2 &#x8DF3;&#x5230;key3:2:0&#x4E0A;&#x65F6;&#xFF0C;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x5220;&#x9664;&#x6807;&#x8BB0;&#xFF0C;&#x6E05;&#x7A7A;saved key&#xFF08;&#x5176;&#x4E2D;&#x4FDD;&#x5B58;&#x7684;&#x662F;key3:1:1&#xFF09;&#x3002;
S3 &#x5FAA;&#x73AF;&#x7EE7;&#x7EED;&#xFF0C;&#x8DF3;&#x5230;key2:1:1&#x4E0A;&#xFF0C;&#x6B64;&#x65F6;key2:1:1 &gt; saved key&#xFF0C;&#x8BBE;&#x7F6E;saved key&#x4E3A;key2:1:1&#xFF0C;&#x5E76;&#x7EE7;&#x7EED;&#x5FAA;&#x73AF;&#x3002;
S4 &#x5FAA;&#x73AF;&#x7EE7;&#x7EED;&#xFF0C;&#x8DF3;&#x5230;key2:2:1&#x4E0A;&#xFF0C;&#x6B64;&#x65F6;key2:2:1 &gt; saved key&#xFF0C;&#x8BBE;&#x7F6E;saved key&#x4E3A;key2:2:1&#xFF0C;&#x5E76;&#x7EE7;&#x7EED;&#x5FAA;&#x73AF;&#x3002;
S5 &#x8DF3;&#x5230;Key1:1:1&#x4E0A;&#xFF0C;&#x56E0;&#x4E3A;key1:1:1 &lt; saved key&#xFF0C;&#x8DF3;&#x51FA;&#x5FAA;&#x73AF;&#x3002;
&#x6700;&#x7EC8;&#x72B6;&#x6001;iter_&#x4F4D;&#x7F6E;&#x5728;key1:1:1&#x4E0A;&#xFF0C;&#x800C;saved key&#x4FDD;&#x5B58;&#x7684;&#x5219;&#x662F;key2:2:1&#x4E0A;&#xFF0C;&#x8FD9;&#x4E5F;&#x5C31;&#x662F;Prev&#x5E94;&#x8BE5;&#x5B9A;&#x4F4D;&#x5230;&#x7684;&#x503C;&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#x5728;Prev&#x64CD;&#x4F5C;&#x4E0B;&#xFF0C;iter_&#x7684;&#x4F4D;&#x7F6E;&#x5E76;&#x4E0D;&#x662F;&#x771F;&#x6B63;&#x7684;key&#x4F4D;&#x7F6E;&#x3002;&#x8FD9;&#x5C31;&#x662F;&#x524D;&#x9762;Get&#x7CFB;&#x51FD;&#x6570;&#x4E2D;&#xFF0C;&#x5728;direction&#x4E3A;kReverse&#x65F6;&#xFF0C;&#x8FD4;&#x56DE;saved key/value&#x7684;&#x539F;&#x56E0;&#x3002;
&#x540C;&#x7406;&#xFF0C;&#x5728;Next&#x65F6;&#xFF0C;&#x5982;&#x679C;direction&#x662F;kReverse&#xFF0C;&#x6839;&#x636E;&#x4E0A;&#x9762;&#x7684;Prev&#x53EF;&#x4EE5;&#x53D1;&#x73B0;&#xFF0C;&#x6B64;&#x65F6;iter&#x521A;&#x597D;&#x662F;saved key&#x7684;&#x524D;&#x4E00;&#x4E2A;entry&#x3002;&#x6267;&#x884C;<strong>iter-&gt;Next()</strong>&#x5C31;&#x8DF3;&#x5230;&#x4E86;saved key&#x7684;dentry&#x8303;&#x56F4;&#x7684;sequence&#x6700;&#x5927;&#x7684;&#x90A3;&#x4E2A;entry&#x3002;&#x5728;&#x524D;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4E2D;&#xFF0C;&#x5728;Prev&#x540E;&#x6267;&#x884C;Next&#xFF0C;&#x90A3;&#x4E48;iter&#x9996;&#x5148;&#x8DF3;&#x8F6C;&#x5230;key2:3:1&#x4E0A;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x8C03;&#x7528;FindNextUserEntry&#x5FAA;&#x73AF;&#xFF0C;&#x4F7F;iter&#x5B9A;&#x4F4D;&#x5728;key2:2:1&#x4E0A;&#x3002;
&#x4E0B;&#x9762;&#x9996;&#x5148;&#x6765;&#x5206;&#x6790;Next&#x7684;&#x5B9E;&#x73B0;&#x3002;&#x5982;&#x679C;direction&#x662F;kReverse&#xFF0C;&#x8868;&#x660E;&#x4E0A;&#x4E00;&#x6B21;&#x505A;&#x7684;&#x662F;kReverse&#x8DF3;&#x8F6C;&#xFF0C;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;iter<em>&#x4F4D;&#x4E8E;key&#x662F;this-&gt;key()&#x7684;&#x6240;&#x6709;entry&#x4E4B;&#x524D;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x5148;&#x628A;iter</em>&#x8DF3;&#x8F6C;&#x5230;this-&gt;key()&#x5BF9;&#x5E94;&#x7684;entries&#x8303;&#x56F4;&#x5185;&#x3002;</p>
<pre class="language-"><code>void DBIter::Next() {  
    assert(valid_);  
    if (direction_ == kReverse) { //&#x9700;&#x8981;&#x9884;&#x5904;&#x7406;&#xFF0C;&#x5E76;&#x66F4;&#x6539;direction=kForward  
      direction_ = kForward;  
      // iter_&#x521A;&#x597D;&#x5728;this-&gt;key()&#x7684;&#x6240;&#x6709;entry&#x4E4B;&#x524D;&#xFF0C;&#x6240;&#x4EE5;&#x5148;&#x8DF3;&#x8F6C;&#x5230;this-&gt;key()  
      // &#x7684;entries&#x8303;&#x56F4;&#x4E4B;&#x5185;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x505A;&#x5E38;&#x89C4;&#x7684;skip  
        if (!iter_-&gt;Valid()) iter_-&gt;SeekToFirst();  
        else iter_-&gt;Next();  
        if (!iter_-&gt;Valid()) {  
          valid_ = false;  
          saved_key_.clear();  
          return;  
        }  
      }  
      // &#x628A;saved_key_ &#x7528;&#x4F5C;skip&#x7684;&#x4E34;&#x65F6;&#x5B58;&#x50A8;&#x7A7A;&#x95F4;  
      std::string* skip =&amp;saved_key_;  
      SaveKey(ExtractUserKey(iter_-&gt;key()), skip);// &#x8BBE;&#x7F6E;skip&#x4E3A;iter_-&gt;key()&#x7684;user key  
      FindNextUserEntry(true, skip);  
}
</code></pre><p>&#x63A5;&#x4E0B;&#x6765;&#x662F;Prev()&#xFF0C;&#x5176;&#x5B9E;&#x548C;Next()&#x903B;&#x8F91;&#x76F8;&#x4F3C;&#xFF0C;&#x4F46;&#x65B9;&#x5411;&#x76F8;&#x53CD;&#x3002;</p>
<p>&#x5982;&#x679C;direction&#x662F;kForward&#xFF0C;&#x8868;&#x660E;&#x4E0A;&#x4E00;&#x6B21;&#x662F;&#x505A;&#x7684;&#x662F;kForward&#x8DF3;&#x8F6C;&#xFF0C;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;iter_&#x6307;&#x5411;&#x5F53;&#x524D;&#x7684;entry&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x8C03;&#x6574;iter&#xFF0C;&#x4F7F;&#x5176;&#x6307;&#x5411;&#x5230;&#x524D;&#x4E00;&#x4E2A;key&#xFF0C;iter&#x7684;&#x4F4D;&#x7F6E;&#x662F;&#x8FD9;&#x4E2A;key&#x6240;&#x6709;record&#x5E8F;&#x5217;&#x7684;&#x6700;&#x540E;&#x4E00;&#x4E2A;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;sequence&#x6700;&#x5C0F;&#x7684;&#x90A3;&#x4E2A;record&#x3002;</p>
<pre class="language-"><code>void DBIter::Prev() {  
    assert(valid_);  
    if (direction_ == kForward) { //&#x9700;&#x8981;&#x9884;&#x5904;&#x7406;&#xFF0C;&#x5E76;&#x66F4;&#x6539;direction  
      // iter_&#x6307;&#x5411;&#x5F53;&#x524D;&#x7684;entry&#xFF0C;&#x5411;&#x540E;&#x626B;&#x63CF;&#x76F4;&#x5230;key&#x53D1;&#x751F;&#x6539;&#x53D8;&#xFF0C;&#x7136;&#x540E;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x505A;  
      //&#x5E38;&#x89C4;&#x7684;reverse&#x626B;&#x63CF;  
        assert(iter_-&gt;Valid());  // iter_&#x5FC5;&#x987B;&#x5408;&#x6CD5;&#xFF0C;&#x5E76;&#x628A;saved key&#x8BBE;&#x7F6E;&#x4E3A;iter_-&gt;key()  
        SaveKey(ExtractUserKey(iter_-&gt;key()), &amp;saved_key_);  
        while (true) {  
            iter_-&gt;Prev();  
        if (!iter_-&gt;Valid()) { // &#x5230;&#x5934;&#x4E86;&#xFF0C;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;  
            valid_ = false;  
            saved_key_.clear();  
            ClearSavedValue();  
            return;  
          }  
          if (user_comparator_-&gt;Compare(ExtractUserKey(iter_-&gt;key()),  
                                   saved_key_) &lt; 0) {  
            break; // key&#x53D8;&#x5316;&#x5C31;&#x8DF3;&#x51FA;&#x5FAA;&#x73AF;&#xFF0C;&#x6B64;&#x65F6;iter_&#x521A;&#x597D;&#x4F4D;&#x4E8E;saved key&#x5BF9;&#x5E94;&#x7684;&#x6240;&#x6709;entry&#x4E4B;&#x524D;  
          }  
        }     
        direction_ = kReverse;  
      }  
      FindPrevUserEntry();  
}
</code></pre><p>&#x63A5;&#x4E0B;&#x6765;&#x8981;&#x5206;&#x6790;&#x7684;&#x662F;&#x63D2;&#x5165;&#x548C;&#x5220;&#x9664;&#x64CD;&#x4F5C;&#x3002;</p>
<h3 id="145-&#x5C0F;&#x7ED3;"><a name="145-&#x5C0F;&#x7ED3;" class="anchor-navigation-ex-anchor" href="#145-&#x5C0F;&#x7ED3;"><i class="fa fa-link" aria-hidden="true"></i></a>14.5 &#x5C0F;&#x7ED3;</h3>
<p>&#x67E5;&#x8BE2;&#x64CD;&#x4F5C;&#x5E76;&#x4E0D;&#x590D;&#x6742;&#xFF0C;&#x53EA;&#x9700;&#x8981;&#x6839;&#x636E;seq&#x627E;&#x5230;&#x6700;&#x65B0;&#x7684;&#x8BB0;&#x5F55;&#x5373;&#x53EF;&#x3002;&#x77E5;&#x9053;leveldb&#x7684;&#x904D;&#x5386;&#x4F1A;&#x6BD4;&#x8F83;&#x590D;&#x6742;&#xFF0C;&#x4E0D;&#x8FC7;&#x4E5F;&#x6CA1;&#x60F3;&#x5230;&#x4F1A;&#x8FD9;&#x4E48;&#x590D;&#x6742;&#x3002;&#x8FD9;&#x4E3B;&#x8981;&#x662F;&#x5F97;&#x76CA;&#x4E8E;sstable 0&#x7684;&#x91CD;&#x5408;&#x6027;&#xFF0C;&#x4EE5;&#x53CA;memtable&#x548C;sstable&#x6587;&#x4EF6;&#x7684;&#x91CD;&#x5408;&#x6027;&#x3002;</p>
<p><strong>leveldb&#x6E90;&#x7801;&#x5206;&#x6790;&#x5168;&#x7CFB;&#x5217;&#x5B8C;&#x3002;</strong> </p>
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